如何通过连续翻译图像来创建循环动画？

Question

通过使用这样的重复图像，

是否可以像这样创建动画？

Answer 1

我明白了


MainActivity.java：

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final int screenWidth = getScreenDimensions(this).x;
        final int waveImgWidth = getResources().getDrawable(R.drawable.wave).getIntrinsicWidth();
        int animatedViewWidth = 0;
        while (animatedViewWidth < screenWidth) {
            animatedViewWidth += waveImgWidth;
        }
        animatedViewWidth += waveImgWidth;


        View animatedView = findViewById(R.id.animated_view);
        FrameLayout.LayoutParams layoutParams = (FrameLayout.LayoutParams) animatedView.getLayoutParams();
        layoutParams.width = animatedViewWidth;
        animatedView.setLayoutParams(layoutParams);


        Animation waveAnimation = new TranslateAnimation(0, -waveImgWidth, 0, 0);
        waveAnimation.setInterpolator(new LinearInterpolator());
        waveAnimation.setRepeatCount(Animation.INFINITE);
        waveAnimation.setDuration(2500);

        animatedView.startAnimation(waveAnimation);
    }

    public static Point getScreenDimensions(Context context) {
        int width = context.getResources().getDisplayMetrics().widthPixels;
        int height = context.getResources().getDisplayMetrics().heightPixels;
        return new Point(width, height);
    }

}

activity_main.xml中：

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <View
        android:id="@+id/animated_view"
        android:layout_width="match_parent"
        android:layout_height="74dp"
        android:background="@drawable/wave_repeating_bg" />

</FrameLayout>

wave_repeating_bg.xml：

<?xml version="1.0" encoding="utf-8"?>
<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
    android:src="@drawable/wave"
    android:tileMode="repeat" />

绘制-xxhdpi / wave.jpg：